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In circuit breakers this feature will provide faster or slower responses for larger or smaller overcurrents, respectively. Ie Big overcurrents will trip quickly, and small overcurrents will allow more time before tripping.

This is good as it allows overcurrents time to correct themselves (like when a refrigerator motor fires up there is a spike in current) without tripping and requiring attention; and larger overcurrents (faults) will trip quickly keeping the circuit safe from overloading, and say, catching fire.

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